Have you ever faced customer complaints because of beverage can leakage — even after perfecting your drink formula?

A single leak can ruin not only the packaging but also your brand image, reputation, and sales performance. In fact, industry data shows that 23% of packaging complaints are caused by leakage issues, and return rates for leaking cans are 5–8 times higher than normal. Over 60% of consumers say they would not repurchase a brand after encountering leakage.

Behind most of these failures lies one key factor: can coating technology. Let’s explore why coating quality determines the integrity and success of your beverage packaging.

Why Leakage Happens in Aluminum Cans

1. The Challenge of Material Science

Aluminum cans are incredibly thin — just 0.2–0.3 mm, roughly the thickness of three human hairs. Achieving a perfect seal on such delicate material requires precision at every step of production.

2. Critical Manufacturing Stages

• Can forming: structural uniformity and metal integrity.

• Deep drawing and stamping: preventing microscopic cracks.

• Coating application: ensuring even coverage and no exposed metal.

3. Lid Sealing Precision

• Seam structure: accuracy in double-seaming design.

• Sealant distribution: uniform adhesive layer without air gaps.

• Pressure control: consistent sealing pressure across every can.

Why Every Beverage Can Needs an Internal Coating

Most beverage cans are made of aluminum or tinplate, both of which can chemically react with the drink inside. Without a coating barrier, several problems arise:

• Acidic drinks (e.g., lemon soda, cola) corrode metal and release ions into the beverage.

• Alkaline drinks (e.g., sports or tea-based drinks) can also damage the metal surface.

• Flavor contamination occurs when metal ions alter the original taste.

• Health risks may result from excessive metal ion intake.

That’s why a reliable food-grade can coating is essential — it isolates the drink from the metal, ensuring freshness, safety, and flavor integrity.

The Coating: A Custom Protective Armor for Your Cans

At ERJIN, we tailor every coating solution according to the pH and chemical characteristics of your beverage:

▪ For Strongly Acidic Beverages (pH 2.5–3.5)

High-barrier epoxy resin coatings create a dense protective layer that resists acid erosion and maintains product stability.

▪ For Mildly Acidic Drinks (pH 4.0–5.5)

Modified polyester coatings provide balanced protection and cost efficiency for juices and teas.

▪ For Neutral or Alkaline Drinks (pH ≥ 6.0)

Water-based acrylic coatings offer eco-friendly protection, fully compliant with global food contact standards.

ERJIN’s Four Breakthroughs in Can Coating Technology

1. Smart Adaptive Coating Systems

We’ve developed specialized coating formulas for different beverage categories:

• Acidic Drink Coating

  • pH range: 2.5–4.5

  • Exceptional acid resistance

  • Prevents permeation of acidic components

• Alcoholic Beverage Coating

  • Superior ethanol barrier properties

  • Prevents softening and swelling of the film

  • Keeps flavor pure and stable

2. Precision Coating Control Technology

• Thickness accuracy: maintained within ±1 μm.

• 100% surface coverage: even in hard-to-coat corners.

• Seam sealing consistency: every lid sealed with micron precision.

• Real-time quality monitoring: automated inspection rejects coating defects instantly.

3. Reinforced Multi-Layer Protection System

Each layer serves a distinct purpose — from corrosion resistance to flavor protection — guaranteeing zero leakage performance even under extreme conditions.

4. Green & Safe Materials

• BPA-Free (Bisphenol-A free) and fully food-grade.

• Certified by FDA, GB4806.1, and SGS.

• Sustainable, solvent-free coatings that meet global environmental standards.

Tailor-Made Coating Solutions for Every Brand

We don’t just provide coatings — we deliver complete technical assurance for your beverage packaging:

• Free sample testing: compatibility validation for your specific beverage formula.

• Process optimization: curing and application guidance to achieve best performance.

• Full technical support: from trial runs to full-scale production.

• Ongoing quality audits: continuous improvement to maintain top-tier standards.

From raw material inspection to final shipment verification, our four-level quality control system ensures every can meets international standards.

Our Commitment: Zero Leakage, Maximum Trust

Every can that leaves ERJIN’s facility carries our promise of precision, safety, and reliability. We understand that leakage is not merely a technical issue — it’s a test of brand credibility. That’s why we pursue zero-defect manufacturing, combining advanced technology with strict quality management to deliver leak-proof beverage packaging solutions that protect both your drink and your reputation.

If you’re facing challenges with beverage leakage or can compatibility, contact our technical team today to receive a custom coating consultation and unlock the next level of packaging excellence.